This chapter discusses less common relations.
It's possible to treat two complementary N-1 relations as one many-to-many relation, thus benefiting from the advantages of a shared list. In RedBeanPHP 4.1+ you can use the aggr() method of a bean to collect the parent beans for each member of an own-list:
$targets = $quest1->aggr( 'ownQuestTargetList', 'target', 'quest' );
This code will iterate over the ownQuestionTargetList and for every questTarget bean in the list it will load the bean in the target property as a bean of type 'quest'. This relation could not have been formed as as shared list because a shared list does not allow aliases. Without aliases the relation would have been a symmetrical one, lacking the notion of direction. Another solution to this problem would be to use the shared list and create a VIEW of quest called target.
One-to-one relations are not used frequently. Traditional 1-1 records are linked by their primary keys. Load them like this:
list( $author, $bio ) = R::loadMulti( 'author,bio', $id );
This loads an author and a biography with the same ID. You need to make sure the IDs are in sync yourself.
In RedBeanPHP one-to-one relations are an anti-pattern, the fields should belong to the same bean. This method has been added for compatibility reasons only, try to avoid it!
To load a bean whose type is determined by another column:
$ad = $page->poly( 'contentType' )->content;
This code returns the bean referred to in content_id using the bean type specified in column content_type. If content_type contains the value 'advertisement' the content will be a bean of type 'advertisement'.
This is an anti-pattern in RedBeanPHP, do not use this functionality unless you have to.
Use poly() to retrieve polymorph data from an external or legacy database only.
back to main menu
Performance monitor: this page has been generated in 0.019116163253784s. Is the performance lacking? Please drop me an e-mail to notify me!